This is how The ritual begins and Venom betrays the Overlord Entity goes in Shadow of the Entity.
[The Overlord Entity is standing]
The Overlord Entity: At last.
[Mac is forced to get down]
[The Entity grins]
The Overlord Entity: Finally.
[Mac is angered]
Mac Grimborn: Why would you help them, princesses?
Princess Celestia: Because we needed to make it believable.
Mac Grimborn: Believable?
Princess Luna: Ask the Symbiote.
[Venom stands to the Entity]
The Overlord Entity: Only one can remain.
[He drains Venom's powers]
[Mac is shocked]
[Then he turns to Mac]
The Overlord Entity: Only one can remain.
[Then he drains his power]
The Overlord Entity: Do you feel the power? I do! Oni, it is time. We will shed our skins for new ones, and be the most powerful force in all of Ninjestria!
[The Omega begins reading the spell]
Venom: Creator, let me stand beside you.
The Overlord Entity: Yes. Yes. Join me. After today, not only will I be Ninjestria's number one entity, but Ninjestria's number one ruler!
Twilight Sparkle: There's one element you forgot!
The Overlord Entity: And what is that?
Princess Celestia: The element of surprise.
[Venom throws away the staff]
The Overlord Entity: You betray me?!
Venom: I'm a Symbiote. It's what we do.
[Mac is confused]
Mac Grimborn: That was all an act?
Princess Celestia: Yep. We had it all under control. Well, almost.
[Mac smiles]
[The Entity is angered]
The Overlord Entity: I should've known it'd be more difficult to make you ladies see things my way.
Princess Luna: Never force us to join you.
[She blasts him]
Mac Grimborn: Why didn't you tell us you were pretending to join the Entity?
Princess Celestia: We didn't tell you because we wanted your reactions to be real.
Mac Grimborn: You reeled out my freak-outs?
Princess Luna: Yes.
[He sighs]
Mac Grimborn: Remember how I used to react?
Twilight Sparkle: Yeah?
Mac Grimborn: I changed.
Twilight Sparkle: The Entity was right. This thing's awesome.
[They uses it against more Oni as their eyes turn red]
Mac Grimborn: Princesses, it holds too much power! Destroy it! [turns to Venom] The power is corrupting them. If we don't get that staff away from them—
Princess Celestia: No one is taking our staff! You had all that power. Now it's our turn!
[The princesses' eyes return to normal]
Princess Celestia: Ah, what am I saying?
[Their eyes get corrupted again]
Princess Celestia: Nothing we don't already feel!
[The Entity grins]
The Overlord Entity: Yes, yes. Embrace the power.
[They try to control it]
Princess Luna: We can't... We can't control it.
[Their eyes get corrupted again]
Princess Luna: We don't want to control it! We should've been the ultimate ones.
Mac Grimborn: No, princesses. Don't!
[Then a crash is heard]
[Mac sees a Roto Jet]
[The heroes defeat the Shadows]
[Ocellus runs to Mac]
Mac Grimborn: Ocellus, it's so good to see you.
Ocellus: And it's good to be back.
[The Entity is enraged]
[He sees his staff]